and 124 degrees 5 minutes.

HIBERNIA SHOAL, seen by Mr. Samuel Ashmore, Commander of the ship
Hibernia, consists of two small sandbanks in the centre of a shoal, four
miles in extent, lying in an east and west direction. It is in latitude
11 degrees 56 minutes, and longitude 123 degrees 28 minutes, by
chronometers.

Mr. Ashmore also saw another shoal in 1811, the particulars of which are
detailed in the following letter.

"The north-east end of the shoal, fell in with on the 11th June, 1811, by
a good noon observation, is in 12 degrees 11 minutes South, longitude by
chronometer 122 degrees 58 minutes 30 seconds (allowing the south head of
Port Jackson to be in 151 degrees 25 minutes 25 seconds). To the westward
of the barrier of black rocks, that presented themselves to our view,
were several sandbanks, the highest of which, on the east end, appeared
to have some vegetation: the rocks in general were six or eight feet
above the water and the surf broke violently on the North-East and
South-East points in view. The shoal trends in a West by North direction
for six or seven miles," It is distinguished on the chart by the name of
ASHMORE'S SHOAL.

SCOTT'S REEF (see Horsburgh volume 1 page 102) was discovered by Captain
Heywood, R.N., in 1811: the north-west end is in latitude 13 degrees 52
1/2, and longitude 121 degrees 59 minutes; thence it extends South 16
degrees East for eighteen or nineteen miles to the north-east point, in
latitude 14 degrees 1 minute, and longitude 122 degrees 16 minutes; the
south extent was not ascertained. It is ninety-seven miles due East from
the situation assigned to Dampier's Rocks. The Cartier also struck upon a
shoal hereabouts, and Captain Horsburgh seems to think that there is
little doubt of Scott's Reef being the same that Dampier saw, as well as
that on which the Cartier struck.

ROWLEY'S SHOALS consist of three separate reefs, the westernmost is the
Imperieuse, the middle Clerke's, and the north-easternmost the Mermaid's.
The Imperieuse is ten miles in length from north to south, and its
greatest breadth five miles: it is surrounded by very deep water and near
the eastern edge, in latitude 17 degrees 35 minutes, and longitude 118
degrees 51 minutes, are some dry rocks. Clerke's Shoal (south end in
latitude 17 degrees 28 minutes, longitude 119 degrees 18 minutes) extends
to the north-west, and probably joins the Minstrel's Shoal, which is
described below, and, if this is the case,